Expanding reamer.



946,384. Patented Jan. 1 1, 1910.

'- ream to the bottom of a hole.

JOHN G. MATTHEWS, 0F OBERLIN, OHIO.

EXPANDING REAMER.

Specification of Letters Patent.

Patented'J an. 11, 1910.

Application filed November 23, 1908. Serial No. 464,108.

To all whom it may concern:

Be it known that I, JOHN G. MATTHEWS, a citizen of the United States, residing at Oberlin, Ohio, have invented certain new and useful Improvements in Expanding Reamers, of which the following is a specification.

This invention relates to improvements in expansible reamers.

The main objects of this invention are: First, to provide an improved expansible reamer of large dimensions which is conveniently and easily adjusted, and, at the same time, one which is very strong and capable of doing very heavy work. Second, to provide an improved expansible reamer which it is impossible to adjust while in the machine. Third, to provide an improved expansible reamer which may be used to Fourth, to provide an improved expans'ible reamer having blades of high-grade steel, which is capable of expansion so that the size of the tool may be maintained, and one which is, atthe same time, simple and economical to manufacture.

Further objects, and objects relating to structural details, definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described -in the following specification.

The invention is clearly definedand pointed out in the claims.

A structure embodying the features of my invention is clearly illustrated in the accompanying drawing, forming a part of this, specification, in which:

Figure 1 is a detail view of a structure embodying the features of my improvement, the body or shell of the reamer and the expanding plug thereof being shown in longitudinal sections. Fig. 2 is a cross section, taken on .a line corresponding to line 22 of Fig. 1. Fig. 3 is an end view of Fig. 1. Fig. 4 is a side elevation of the key for adjusting theexpandingplug. vFig. 5 is a side elevation of a modified form of key.

'In the drawings, similar reference characters refer to similar parts throughout, the several views,-and the sectional views are taken looking in the direction of the little arrows at the ends of the section liner.

Referring to the drawing, the body or shell 1 in my improved reamer is preferably formed-of soft or machinery steel, and is provided with a plurality of longitudinal slits 2 at its outer end, dividing the body 1nto sections. The cutting blades 3, which are preferably of high speed or air;

hardening steel, are preferably inserted and secured according to the process described in Letters Patent No. 848,112, issued to me on the 26th day of March, 1907. The body or shell is tubular and is provided with a conical 'or tapered bore l at its outer end,

adapted to receive'the tapered or conical portion 5 of the expanding plug 6. body or shell is provided with internal threads 7, the threads being preferably in the unslitted portion of the body and the plug is provided with threads 8 at its inner end so that it may be adjusted to expand the reamer.

The expanding plug has a notch 9 at its outer end adapted to receive the tangs 10 of the key or adjusting tool 11. This key or adjusting tool is preferably in the form of a plug adapted to be inserted in the expanding plug, the tangs 10 preferably being The formed by inserting a pin through the plug, as at 10,Fig. 4, or inserting keys, as at v10, Fig. 5, so that the key may be inserted in the expanding plug and the expanding plug adjusted thereby. Obviously, one tang only need be used, if desired. The end of the key is preferably squared to receive a wrench, although it may be provided with a suitable fixed handle.

The arbor 12 is provided with a tapered portion 13 to receive the tapered portion 14 of the bore of the reamer body. The arbor is provided with a collar 15, having driving lugs "16 thereon to engage the notches 17 in the reamer body. The arbor is also preferably rovided with a reduced portion 18 adapte to fit into the bore 'of the expanding plug v6, preferably fitting the same closely so that the reamer will be alined true with the arbor. lVhen thus arranged, the arbor also prevents the adjustment of the reamer while in the machine,

which is of advantage asworkmen sometimes wish to adjustreamers when it is desirablethat theyshould not- This arrangeinent of the parts enables the making ofsatisfactor expanding shell reamers of large size.- s the expanding screw does not project beyond the end of the reamer, it permits the reaming of a hole to its bottom. Thecutting blades, by this arrangem'ent of'parts,.are supported as solidly as though the reamer had a solid body. It will be appreciated that this is a great advantage, inasmuch as even the slightest variation, such as is occasioned by .the springing of a blade mechanically held in a Shell reamer, particularly one of large size, is a serious objection.

Having thus described my invention, what I claim as new and desire to secure by Let ters Patent is:

1. A reaming tool comprising a tubular body having longitudinal slits in its outer end, said slits dividing the outer end of said body into sections and the unslitted portion of said body being internally threaded; cutting blades carried by said body; a hollow expanding plug for said body having a tapered portion at its outer end and a threaded portion at its inner end, said plug having a notch at its outer end adapted to receive the tang of an adjusting key; and an arbor adapted to receive said body, said arbor having a reduced portion adapted to fit the bore of said expanding plug whereby the same is supported in alinement and the adjustment of said expanding plug prevented while [said body is arranged upon the arbor.

2. A reaming tool comprising a tubular body having longitudinal slits in its outer end, said slits dividing the outer end of said body into sections and said. body being internally threaded; cutting blades carried by said body; and a hollow expanding plug for said body having a tapered portion at its outer end and a threaded portion at its inner end, said plug having an internal notch at its outer end adapted to receive the tang of an adjusting key.

3. A reaming tool comprising a tubular body having longitudinal slits therein; cutting blades carried by said body; a screw threaded hollow expanding plug for said body having a tapered portion ad. ted to engage the slitted portion of said b0, y, said plug having an internal notch at its outer end adapted to receive the tang of an adjusting key; and. an arbor adapted to receive said body, said arbor having a rekey.

eaasea 7 body having a tapered portion adapted to engage the slitted portion of said body, said plug being adapted to receive an ad usting 5. A reaming tool comprising a tubular body having longitudinal slits therein, said body having a tapered hole at its rear end and driving notches; cutting blades carried by said body; a hollow expanding plug I for said body having a tapered portion adapted to engage the slitted portion of said body threaded into said body the bore of which is centrally located; an arbor hav ing a tapered portion to receive the tapered hole of said body; and driving lugs adapted to engage the notches of said body, said arbor being also provided with a forwardlyprojecting reduced portion tapered to fit the said hollow expanding plug, all coacting for the purpose specified.

6. A reaming tool comprising a tubular body-having longitudinal slils therein, said body having a tapered hole at its rear end; cutting blades carried by said body; a hollow expanding plug for said body having a tapered portion adapted to engage the slitted portion of said body threaded into said body, the bore of whichv is centrally located; an arbor having a tapered portion to receive the tapered hole of said body, andengage the same, and adapted to fit the bore of said expanding plug, as specified.

In witness whereof, I have hereunto set my hand and seal in the presence of two witnesses.

JOHN G. MATTHEWS. 

